// SPDX-License-Identifier: GPL-2.0-only
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/*
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* POWER Data Stream Control Register (DSCR) SPR test
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*
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* This test modifies the DSCR value through both the SPR number
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* based mtspr instruction and then makes sure that the same is
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* reflected through mfspr instruction using either of the SPR
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* numbers.
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*
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* When using the privilege state SPR, the instructions such as
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* mfspr or mtspr are priviledged and the kernel emulates them
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* for us. Instructions using problem state SPR can be exuecuted
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* directly without any emulation if the HW supports them. Else
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* they also get emulated by the kernel.
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*
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* Copyright 2013, Anton Blanchard, IBM Corporation.
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* Copyright 2015, Anshuman Khandual, IBM Corporation.
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*/
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#include "dscr.h"
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static int check_dscr(char *str)
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{
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unsigned long cur_dscr, cur_dscr_usr;
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cur_dscr = get_dscr();
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cur_dscr_usr = get_dscr_usr();
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if (cur_dscr != cur_dscr_usr) {
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printf("%s set, kernel get %lx != user get %lx\n",
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str, cur_dscr, cur_dscr_usr);
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return 1;
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}
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return 0;
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}
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int dscr_user(void)
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{
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int i;
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SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));
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check_dscr("");
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for (i = 0; i < COUNT; i++) {
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set_dscr(i);
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if (check_dscr("kernel"))
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return 1;
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}
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for (i = 0; i < COUNT; i++) {
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set_dscr_usr(i);
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if (check_dscr("user"))
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return 1;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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return test_harness(dscr_user, "dscr_user_test");
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}
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